<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script src="../../js/jquery-1.11.3.js"></script>
</head>
<body>
<input type="button" value="请求">
<div class="js_head">

</div>
<div class="js_body">

</div>
<script>
    $(function(){
        $('input').click(function(){
            $.ajax('a.html',{
                success:function(data){
                    console.log(data);
                    $(".js_head").html(data);
                }
            })
            $.get('b.html',function(data){
                $(".js_body").html(data);
            })

        })
    });
</script>


</body>
</html>